01:119:150 Lecture Notes - Lecture 4: Nematicide, Organochloride, Fungicide
30 Sep 2020
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Document Summary
Pesticide - any chemical used to cause the death of a pest organism: insecticide. Three modes of entry: ingestion, contact, inhalation. Four classes of compound: organochlorides (persistent, organophosphates (highly toxic to humans and other animals, account for most human pesticide poisonings and deaths, carbamates, natural pesticides, fungicide. Disrupt the normal functioning of the cells of fungi: herbicide. Designed to kill plant parts through: contact, absorption, entering the roots of plants. Can cause substantial damage if used indiscriminately. Widespread use is disrupting ecosystems: nematicide. Used to kill rodents that carry disease. Ddt (an organochloride insecticide) - an organic pollutant that was initially very successful, but is now widely prohibited. Can affect other species besides the target species. Very effective, long lasting effect, widespread effect (overall, persistent in the environment) Fat soluble (stored by organisms in fatty tissues) Trophic chain concentration (concentrated at progressively higher levels of the food chain) Lethal for insects, causes a thinning of the eggshells of birds.
